TS1937 - Taiwan Semiconductor Company

TS1937 Boost (Step-up) WLED Driver

The TS1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 12 LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as small as 0.22µF, .

Features

●
●
●
●
●
●
●
●
● Inherently Matched LED Current High Efficiency: 88% Typical Drives Up to 6 LEDs @ Vin 5V Drives Up to 12 LEDs @ Vin 12~15V 36V Rugged Bipolar Switch Fast 1.2MHz Switching Frequency Requires Only 0.22µF Output Capacitor PWM dimming control 1KHz to 10KHz Analog dimming control Application
●
●
●
●
● Cellular Phones Digital Still Cameras MP3 Players White LED Backlighting PDAs, Handheld computers Ordering Information Part No. TS1937CX5 RF Package SOT-25 Packing 3Kpcs / 7” Reel Typical Application Circuit 1/8 Version: C07 Boost (Step-up) WLED Driver Absolute Maximum Ra.